Proframe is for very wide, round heads. Think brachycephalic Russians round. I have one, it also lacks padding on the head and the mips liner digs into your forehead (maybe they have updated this, because I don’t feel that it is well padded).
I’m going to swap to something else, probably another bell as it has too much unused space at the sides of my head – and ends up making me look bobble headed. I’d borderline fit a medium in another helmet, not this – it would be too short front to rear.
Also, the only pads that are adjustable to make up for there being no dial – are the cheekpieces. Of which there are two sizes, that aren’t very tight in the first place and use overly soft foam.